Catnip triggers a burst of euphoria in cats that typically lasts about 10 minutes. The active compound, nepetalactone, enters a cat’s nasal tissue and activates the brain’s opioid reward system, essentially producing a natural high. Not every cat responds, though. Sensitivity is inherited, and roughly 70 to 80 percent of cats react to the plant at all.
How Catnip Works in a Cat’s Brain
Nepetalactone is an oil found in the leaves and stems of the catnip plant (a member of the mint family). When a cat sniffs catnip, the compound travels through the main olfactory system, the same pathway cats use for everyday smelling. Early research ruled out the vomeronasal organ, a secondary scent-processing structure many animals use to detect pheromones. Surgical removal of the vomeronasal organ in lab studies had no effect on the catnip response, while removing the olfactory bulb eliminated it entirely.
Once nepetalactone reaches the brain, it raises levels of beta-endorphins, the body’s natural feel-good chemicals. This happens through the same opioid receptor network that processes pleasure and reward. When researchers blocked those opioid receptors, cats stopped performing their signature rubbing and rolling behavior, strong evidence that what cats experience is genuinely pleasurable rather than just reflexive.
What the Reaction Looks Like
The classic “catnip response” is hard to miss. Cats may roll on their backs, rub their faces against the source, dart across the room, flip over, or become generally hyperactive. Some cats will lick or chew the plant, drool, or stretch out with a blissed-out expression. Others simply become very relaxed and still. The reaction varies from cat to cat and can even look different in the same cat on different days.
The effects kick in within seconds of sniffing and rarely last more than 15 minutes. After the high wears off, cats enter a refractory period of about one to two hours during which they’re completely immune to catnip’s effects, no matter how much they’re exposed to.
Smelling vs. Eating: Two Different Effects
Whether a cat inhales or ingests catnip changes the outcome. Smelling nepetalactone acts as a stimulant, producing the energetic, playful behavior most people associate with catnip. Eating catnip has the opposite effect: it works as a mild sedative, calming the cat down. Many cats will do both in a single session, sniffing and rubbing first, then chewing and settling into a mellow state.
Why Some Cats Don’t React
Catnip sensitivity is genetic. About 20 to 30 percent of cats carry a version of the gene that leaves them completely indifferent to nepetalactone. There’s no way to predict this from a cat’s breed, color, or personality. It’s a straightforward inherited trait, similar to how some humans can’t detect certain smells.
Age also matters. Kittens under three months old are generally immune to catnip. Most cats begin showing a response between three and six months of age as their opioid system matures. Research suggests this developmental timeline is the reason kittens don’t react: their neurochemistry simply isn’t ready to process the compound yet.
Is Catnip Safe?
Catnip is non-toxic and not addictive. Cats can’t overdose on it in any dangerous way, and they naturally self-regulate by losing interest after the refractory period kicks in. That said, eating too much can cause mild stomach upset, including vomiting, diarrhea, or brief dizziness. These symptoms resolve on their own and aren’t a sign of anything serious. Most cats stop eating before reaching that point.
Alternatives If Your Cat Doesn’t Respond
If your cat falls in the non-responder group, there are other plants worth trying. A study testing four plant materials on domestic cats found that silver vine (a plant native to East Asia) got a response from 79 percent of cats, compared to 68 percent for catnip. The silver vine response was also more intense. Among the 31 cats in the study that ignored catnip entirely, 71 percent responded to silver vine.
Tatarian honeysuckle and valerian root are two other options, though they’re less potent. About 53 percent of cats responded to honeysuckle and 47 percent to valerian. Each plant contains a different mix of active compounds, so a cat that’s unimpressed by one may still react to another. Nearly all cats in the study responded to at least one of the four plants tested, which means there’s a good chance of finding something that works for yours.